# Counties in Ohio by population, 2025

All 88 values come from U.S. Census Bureau for 2025, so the places are comparable.

- Indicator id: `population`
- Unit: persons
- Definition: Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.
- Source: U.S. Census Bureau, Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program) (https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/)
- Retrieved: 2026-10-08
- Citation: U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.
- Web page: https://invokely.ai/rankings/population/ohio-counties
- CSV: https://invokely.ai/download/rankings/population/ohio-counties.csv

| Rank | Place | persons |
|---:|---|---:|
| 1 | Franklin County | 1,361,536 |
| 2 | Cuyahoga County | 1,232,925 |
| 3 | Hamilton County | 838,418 |
| 4 | Montgomery County | 539,598 |
| 5 | Summit County | 538,376 |
| 6 | Lucas County | 423,347 |
| 7 | Butler County | 400,128 |
| 8 | Stark County | 373,771 |
| 9 | Lorain County | 323,219 |
| 10 | Warren County | 257,181 |
| 11 | Delaware County | 242,032 |
| 12 | Lake County | 232,217 |
| 13 | Mahoning County | 224,706 |
| 14 | Clermont County | 216,977 |
| 15 | Trumbull County | 198,972 |
| 16 | Licking County | 185,564 |
| 17 | Medina County | 185,025 |
| 18 | Greene County | 174,322 |
| 19 | Fairfield County | 169,752 |
| 20 | Portage County | 163,404 |
| 21 | Clark County | 135,340 |
| 22 | Wood County | 134,176 |
| 23 | Richland County | 124,893 |
| 24 | Wayne County | 116,758 |
| 25 | Miami County | 112,634 |
| 26 | Allen County | 100,881 |
| 27 | Columbiana County | 99,377 |
| 28 | Ashtabula County | 96,713 |
| 29 | Geauga County | 95,676 |
| 30 | Tuscarawas County | 92,373 |
| 31 | Muskingum County | 87,014 |
| 32 | Ross County | 76,429 |
| 33 | Hancock County | 75,034 |
| 34 | Union County | 73,446 |
| 35 | Erie County | 73,296 |
| 36 | Scioto County | 71,365 |
| 37 | Marion County | 65,115 |
| 38 | Belmont County | 64,434 |
| 39 | Knox County | 64,002 |
| 40 | Jefferson County | 63,597 |
| 41 | Athens County | 63,197 |
| 42 | Pickaway County | 62,978 |
| 43 | Sandusky County | 58,655 |
| 44 | Washington County | 58,389 |
| 45 | Huron County | 58,250 |
| 46 | Lawrence County | 55,710 |
| 47 | Seneca County | 54,522 |
| 48 | Ashland County | 52,523 |
| 49 | Darke County | 51,520 |
| 50 | Shelby County | 48,065 |
| 51 | Madison County | 46,985 |
| 52 | Logan County | 46,302 |
| 53 | Auglaize County | 45,909 |
| 54 | Holmes County | 44,970 |
| 55 | Brown County | 44,397 |
| 56 | Highland County | 43,823 |
| 57 | Mercer County | 42,737 |
| 58 | Clinton County | 42,301 |
| 59 | Crawford County | 41,896 |
| 60 | Fulton County | 41,853 |
| 61 | Preble County | 40,664 |
| 62 | Ottawa County | 39,481 |
| 63 | Champaign County | 38,820 |
| 64 | Guernsey County | 38,379 |
| 65 | Defiance County | 38,292 |
| 66 | Coshocton County | 37,188 |
| 67 | Williams County | 36,549 |
| 68 | Morrow County | 36,305 |
| 69 | Perry County | 35,918 |
| 70 | Putnam County | 34,380 |
| 71 | Jackson County | 32,817 |
| 72 | Hardin County | 30,072 |
| 73 | Gallia County | 29,072 |
| 74 | Van Wert County | 29,013 |
| 75 | Fayette County | 28,552 |
| 76 | Adams County | 27,865 |
| 77 | Henry County | 27,598 |
| 78 | Hocking County | 27,512 |
| 79 | Pike County | 27,061 |
| 80 | Carroll County | 26,475 |
| 81 | Meigs County | 21,587 |
| 82 | Wyandot County | 21,567 |
| 83 | Paulding County | 18,727 |
| 84 | Noble County | 14,276 |
| 85 | Harrison County | 14,070 |
| 86 | Morgan County | 13,626 |
| 87 | Monroe County | 12,994 |
| 88 | Vinton County | 12,645 |